This book is really, really helpful in studying Isaiah! It contains all the chapters of Isaiah from the Bible and the Book of Mormon, and the author clarifies the symbolism used, the pronouns (what/who each of them refer to), the historical information, etc. right along as you read. The author does not really give interpretations, which I appreciate, because that is really something that needs to be done through the Spirit. He simply makes the reading more understandable. My neighbor gave me the copy I read, but I definitely want to buy it for myself to keep as a reference. The only thing I didn't like was that the author has one section for the chapters from the Bible and a different section for the chapters from the Book of Mormon - even though they are very similar, and most of what he writes in each section is duplicated. But every now and then he writes something different in the Bible section that he didn't include in the Book of Mormon section, or vice versa, so if you don't read both sections you might miss out on something. So it was a little annoying flipping back and forth between the 2 sections for the corresponding chapters. But other than that this was an excellent book!!